When Route 210 past Keystone Lake in Armstrong County was originally built in 1971, the construction crews did such an outstanding job, the road has only required resurfacing twice in over 51 years. The Asphalt Paving Alliance has awarded PennDOT District 10 a 2022 Perpetual Pavement Award for the 3.3-mile section of two-lane highway.
To qualify for the award, a pavement must be at least 35 years old and have never experienced a structural failure, with the average interval between resurfacing no less than 13 years. With two resurfacings in 51 years, PennDOT has averaged 18-and-a-half years between repaving and added only 2-and-a-half inches to the thickness of the road.
Route 210 carries an average of 2,425 vehicles per day past Keystone Lake.